Hi Sabin,

the longitudinal qdec file looks correct. It is not used for qdec, but for generating your longitudinal files (using long_mris_slopes). See the tutorial on the wiki for it. http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/LongitudinalTutorial

You would then do a qdec analysis (using a standard cross sectional qdec table) e.g. on the rate of change or percent change.

Best, Martin

On Fri, 2012-04-13 at 16:10 -0400, Sabin Khadka wrote:

Hi all, I am trying to use qdec to perform comparison of cortical thickness in two different time periods. So I ran recon-all base and recon-all -long. then defined long.qdec.table.dat as fsid fsid-base years MRI_001_T1 MRI_001 0 MRI_001_T2 MRI_001 2

When I tried to run qdec it says it "cant find MRI_001_T1/surf/lh.thichkeness.fwhm10.fsaverage.mgh" which I think makes sense because I did not run qcache to smooth the surface. So my question is Is the way I am writing my lon.qdec.table.dat correct or should it be fsid fsid-base years MRI_001_T1.long.MRI_001 MRI_001 0 MRI_001_T2 .long.MRI_001 MRI_001 2

Also, if I need to run qcache should I run in MRI_001_T1 or MRI_001_T1.long.MRI_001.

Thanks. Sabin

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